Question

Diethy ether, the solvent for your Grignard reaction;

-is extremely flammable.

-is heavier than air.

-must be kept dry or the reaction will not work.

-is necessary for the reaction to work.

which ones of the above are right??? (It can be more than one)

Answer 1

1. Diethy ether is extremely flammable, yes it  highly volatileflammable liquid. Its flash point is −45 °C (−49 °F; 228 K).

2. is heavier than air: its density is 0.7134 g/cm³ while the density of air is 1.225 x10⁻³ g/cm³

3. must be kept dry or the reaction will not work. Yes, otherwise while reaction Grignard reagent R-Mg-X will get hydrolysed by trace amount of water.

4: it is necessary for the reaction to work: its work as stabilizer for Grignard reagent R-Mg-X, by chelating with metal.

All above are correct.